Hoist



HOIST Filed Sept. 29, 1950 3 Sheets-Sheet I s m m a i i m 4 a f V 1!...

9 0; A f1- 1 9 2 n h I! H H m; s.@ 4? J 6P @m&

Sept. 22, 1931. F. D. FORADAS ET AL 1,824,339

HOISTV Filed Sept. 29, 1930 3 Sheets-Sheet 2 IN V EN TORS p 1931- F.-D. FORADIAS ET AL 1,324,339

HOIST 3 Sheets-Sheet 3 Filed Sept. 29. 1930 {@m? 6%?Iddd6' A. fivnwflsapes,

mmvroxs l atented Sept. 22, 1931 N I F. 1

stares are HOIST Application filed September 29, 19cc. Serial No. {$85,057. p

This invention relates to hoists and'more in particular to kettle hoists mounted on trucks, for use in candy factories.

One of the main objects of this invention is to provide a hoist adapted to handle the various sizes of kettles used in candy factories for cooking or melting sugar and other ingredients. Another object is to provide means whereby the. various sizes of kettles may be tilted and locked in any desired angula-r position to pour out the contents thereof on the work tables. .A further object'is to provide such a hoist having means whereby the kettles may be raised or lowered, and turned around in horizontal and, vertical planes, as required. Yet another object of this invention is to provide a portable hoist which may be easily transformed into a general utility derrick forthe purpose of handling boxes, barrels and so forth. A still further object of this invention is the provision of ahoist in which all the load handling means are provided with self-lockingmechanisms adapted to hold the load automati-.-

cally in any desired position.

Additional features andi advantages of this invention will appear in the course of the following description considered in connection with the accompanying drawings formng part of this application and in which similar reference numbers indicate corre-q spondlng parts 1n the various figures of the drawings.

In the drawings: o

Fig. 1 is a side elevation, partly in section,of our invention provided with a boom derrick.

Fig. 2 is a front elevation of Fig.1.

Fig. 8 is a fragmentary top viewshowing the operating mechanism for the lifting arms of the device. 1

Fig. 4c is a sectional View taken on line 44 in Fig. 3.

Fig. 5 is an end view showing the kettle gripping and tilting mechanism.

Fig. 6 represents across section taken online 6-6, in Fig. 5.

' Fig. 7 shows a cross-section taken substan- "tially on line 7-7 in Fig. 1.

Fig. 8 is a similar view taken on line 88,

Fig. 1.

Fig. 9 shows another cross-section taken on line 9-9, also in Fig; 1. 1 Y

r bFFICE.

Fig. 10 is a side elevation ofa modified,

fixed, boom for supporting the kettle lifting arms of the device.

Fig. 11 is a fragmentary sectional view, on an enlarged scale, through part of the kettle tilting mechanism.

Fig. 12 is a fragmentary end view of Fig. 11. I 1

Reference being had to the drawings, the kettle handling device comprises the followingrincipal parts: the truck 1, the hoistbase 2 in which is rotatably mounted the hollow coiumn 8 slidably engaged by the post at havingremovably secured at the top the derrick-mast 5, to 'which'is hingedly mount-- ed the boom 6 at Whose 'endjis rotatably secured the slide-frame 7 which supports the two lifting arms 8 on whichthe kettle 9 is suspended.

The truck 1 may be of any desired and suitable type,an d in the present embodiment it has been assumed to be handoperated. It comprises a platform 10 mounted on antifriction casters 11, of any commercial type and preferably provided with locking means, not shown, to hold the truck at any desired place. This truck is also assumed to have a removable push-bar 12, securableat either end of the truck; suitable holding sleeves 13 being provided thereon forthat'purpose.

The hoist-base 2 comprisesa cylindricalshell} 14 having a flanged bottom 15 secured to the truck-platform by nieans of bolts 16. On the base is bolted a split cover 17 to prevent the entrance of dirt, etc., within the shell.

The lower'portion 18 of the column is in-; serted within the shell and is rotatably sup- 1 ported therein by the. antifriction'ball thrust bearing 19 and the annular ball bearing sets 20 and 21, of usual commercial types, respectively locatedadjacent the bottom -and the top of the shell. Upon this lower column portion is secured by means of screws 22, or other wise, a flange-ring 23 in the'rim 24 of which 1 are drilled numerous radially directed and evenly spaced holes 25. These holes may be engaged by the inner end of a lock-pin .26 slidably mounted in a centrally bored hub 27 provided laterally on the shell 14. This pin has a collar 28 and it is guided for longitudinal movement by a centrally bored bushing 29 screwed, or otherwise secured, in the hub 27. Intermediate the collar and the bushing is placed about the pin a coil-spring 30 the tendency of which is to force the pin inwardly into engagement with one of the holes 25. The outer portion of the pin is enlarged, as at 31, and terminates with an eye 32 whereby the pin may be pulled outwardly. In the en-- larged portion there is driven a cross-pin 33 extending at both sides thereof and adapted to engage either one of twosets of rectangu larly disposed diametral slots 34, 35, cut on the rim of the hubr27. The slot 34 is deeper and allows the lock-pin to penetrate within the holes 25, whereas the slot 35 is shallow and serves to hold said lock-pin in inoperative position.

make traveling in the rather narrow aisles betweenthe work tablesin a candy factory possible. The bracket 38 is held on the column against accidental displacement by aremovable pin 40.

On the column are also suitably secured handles 41 by means of which the column may be turned'around.

The post 4 'is slidable within the column and may be moved up or down therein by means of a gear and rack mechanlsm detailed especially in Fig. 7. As shown therein, a rack 42 is secured in any desired and suitable manher to the postand engages asuitable groove 43 (Figs. 1, 2) provided in the column to prevent the post from rotating within the former. The rack is'in mesh with a gear 44 secured on a shaft 45 rotatably mounted in bearings 46 provided in a housing 47 cast integrally with the column 3. Upon this shaft is also secured a worm-gear 48 which is ro-' tated by a worm 49 keyed on a shaft 50 also rotatably mounted in said housing and having a squared outer end 51 which receives a removable crank 52. The wormand wormgear are of the single thread type to produce a self-locking drive mechanism. I

The top of the post 4 has a flange 53 to which is removably secured-by bolts 54- the flange 55 at the foot of the derrick-mast 5.

the upper endof which is bifurcated, as at 56, to accommodate the two pulleys or sheaves 57, 58, freely rotatable on a pin 59 secured inboth legs 60 of the bifurcation.

hoist, on account of the re- On the mast is hingedly mounted by means of the pin connection 61 the boom 6, the inner end of which is suitably bifurcated, as at 62, to accommodate the mast and afford a maximum upward swing of the boom. The 1 downward swing of the latter is preferably limited to a horizontal position by means of stop lugs'63 formed near the bifurcated end of the boom and adapted to bear on the flange 55 of the mast.

At the outer end of-the boom 6 there is clamp comprising a stationary half 64 formed on the boom and a cap 65 hingedly secured theretoby apin connection 66 and held in place by means of the clamping eyebolt '67 Ihingedly-mounted' on the stationary half andta daptedito engage a-slot provided in the ear 68-of said cap. Upon the latter are-cast the two spaced and parallel brackets 65 between which is placed a sheave 69 ro-' tatably mounted upon an arbor 70 one end of which is screwed into ene of said brackets. -At the rear ofthe stationary half there is provided on the boom 6 a rib 71 having 7 hole 72.

When used as a derrick, the load is applied toaswivel hook 73, or any other suit-- able hitchingmeans,secured at the free end of the load lifting chain or cable 74, running over'the' sheaves 69 and 58; for instance. Another chain or cable has its outer end passed through the hole 72 in the rib 71 and secured thereto; it serves to raise and lower the boom.

The cables'or chains 74, 75 are wound. respectively on the winch drums 76 and 77 (Fig. 8) rotat'a'bly and freely mounted on a commonshaft 78 supported in brackets 79 secured by bolts80 to a base 81 cast on the v column-3, At one end of'the drums are secured in any desirable manner the worm gears 82, 83 which are engaged'by their re spective' single-thread and self-locking worms 84 and 85 mounted on the shafts 86, 87, running in bearings 88 supported in the brackets 79, and the outer ends of which are squared to receive the removablecrank 89, 90, by means of which the load-winch and the boom-winch are respectively operated.

The slide-frame 7 comprises the two parallelslide-rails 91 secured at the middle by bolts 92 to a block 93 having at the upper side a journal 94 provided at the top with a retainingcollar 95 and'adapted to be rotatably clamped between the clamphalves 64, 65. Theslide-rails are held at their outer ends by the end-blocks 96 which coutrally -a-pertured' to rotatably support the spindle 97 extending beyond both end-blocks andprovided withsquared ends to receive a crank 98. This spindle serves to move the two lifting :arms. simultaneously and equally toward and away from each other; it is provided for this purpose with the right and left hand threads 99 and 100.

The lifting-arms 8 consist each of aslid ing-head 101 provided with lateral grooves to fit the slide-rails 91 and centrally apertured and threaded to suit the corresponding threads on the spindle 97.. Depending from the sliding-heads are thelifting arms retaining the gear-hub113 in place.

The gear-ring 113 and its hub 113 may be 102,p'roper, which are preferablyof channelshaped cross-section and which haveat their lower ends suitably formed flanged enlarge.-

mentswhich act as protective housings 103:-

for the kettle tilting and clamping mech-v anisms.

The kettle tilting mechanism consists of 7 an operating crank 104 removablyengaging the squared end of a shaft ,105 rotatably mounted in a bearing 106 produced on the housing 103. At the inner end of this shaft is keyed, or otherwise secured, a bevel-gear 107 meshing with another bevel gear 108 secured on. the worm-shaft 109 rotatably mounted in suitable bearings 110 and 111 also positioned in the housing. Upon this worm-shaft is fastened a worm 112 adapted to rotate the worm-gear 113.

This worm-gear consists of a worm gearring 113 mounted for free rotation on a central hub 113 (Figs. 11, 12) freely rotatable ona stationary arbor 114 secured to the housing 103 against rotation by a set-screw 115. This arbor has an outer flange 116 and carries on'its inner end a collar 117 secured thereto by a set-screw 118, for the purpose of freely held rigidly together by means of a spring actuated lock-pin 119, similar in design and operation to the pin 26 above described, and guided by a bracket 120 positioned on the gear-hub. When this pin engages the aperture 121 drilled through the line of contact between the gear-ring and its hub, these two bolted a plate 123 having depending parallel grip-fingers 124-terminating with upwardly directed hooks, or claws, 125 adapted to engage the underside ofthe beading, or roll, 9,

formed on the rim of the kettle 9.

This kettle is clamped to each tilting mechanism byv means... of a rim-clamp 126 swivelly secured at the lower end of a pressure screw 127 engaging thesuitably threaded hub 128 of a horizontal bevel gear 129 rotatably mounted in a bearing formed on the by bolts or screws 131.

plate 123 and having a bearing cap 130:held i The bevel 'gear'129 meshes with another bevel-gear 132 secured on a shaft 133. freely rotatable in thestationary arbor 114 and have:

, ing a collar 134. The outer end of this shaft is also squared and accommodates a removable crank 135. I

It will be noted that the rotation of this crank in the proper direction will cause the rim-clamp 126 to bear. upon the top of the rim of kettle, and thus enable a strong clamps ing of'the latter between said clamp and the claws 125, to prevent any shifting of the kettle, when in tilted position. The pressure-screw 127 being of the single-thread type, provides also asubstantially self-lock ing clamping mechanism for the kettle.

1 The reason for making the gear-rings and" hubs of the worm-gears 113 independently rotatable, is to enable a person to tilt'the kettle by turning but one of the operating handles 104, if necessary on account of local space conditions. If, for instance, the tilt- 7 ing is to be performed from the right side of v the kettle, the lock-pin 119 onthe left side is first pulled outinto inoperativeposition, to permit the left hand gear hub 113 to rotate independently of its gear-ring 113*, since the latter cannot be turned, except by rotating its corresponding worm 112,-on account of the self-locking nature'ofthis drive. 1

When the device is tobe used exclusively as a kettle hoist, i. e.snot as a derrick, the mast 5, the load and boom winches with their cooperating cables and sheaves, and the lifting 'arm mechanism may be eliminated. In this case, the boom 6 need not be hinged and may be replacedby a stationary boom .136, Fig. 10, bolted to the flange 53 ofthe post 4. The

clamping device for the slide frame 7 posi- 1 tioned atthe outer end of'this boom is substantially like the one already described, ex-

cept that the cap 137 is provided with shorter bolt-lugs 138, instead of the sheave-carrying,

brackets 65.

From the above description, the operation of the kettle-hoist will be readily understood I and may be succinctly described as follows! Assuming that a kettle is ready to be taken from the fire to have its contents of melted sugar, for instance, poured ona work table,

the; operator pushes the truck in proper position to place the' kettle substantially halfway between the lifting arms. "The grip fingers 124 arethen brought into engagement with the underside of the roll 9- of thekettle by suitably manipulating the rack-crank 52 and the crank 98'on'the slide-frame. The rimclamps 126 are then' forceddown on therim by turning the cranks 135, to'hold' the kettle tightly in place. Thisdone, the loaded truck is moved to the desired work table and either one of thetilting cranks104is operated,;due

care havingbeen takento unlock the worm gear-drive 113i on the opposite liftingarm, and the melted sugar is then poured: onthe Work tab'lejvvherever needed. Since the tiltin'g mechanism is. self-locking, the kettle will s' -remain in any inclined-position as long as required, Without'ithe Workman having to concern himself with the tiltmgrcrank.

While We have illustrated and described herein the present embodiment of our invenfl tion, itmay befound'desirable after continued'experienceto make slight: changes in the construction and ar-rangementof the ,des

tails crew invention, and We Wish to include in this application all suchchan'gesas fall Withinthe scopeof the appended claims. lVe claim:

1. In a hoist of the character described; a

column a post longitudinally movable there-i in; a boom secured to said post; clamping fi' means positioned at the free end the boom;

, a horizontal slide-frame rotatably supported 1 in said clamping means lifti;nggarms depend:

ing from said frame; loadigrippin'g means positioned on the lifting arms, and means to 'E 'Vary the distance between said arms.

2.' Ina hoist of the character described, a column; a post longitudinallymovable therein; a boom secured to said post; clamping means positioned at the free endof the boom;

36 1a horizontal slide-framerotatably'supported insaid clamping means; lifting arms de-v pending from said frame; load gripping means positioned on the lifting arms, and unitary means to'vary the distance between said arms. 5 N t 3. In a hoist of the character described, a column; a post longitudinally movable therein; a boom secured to said post; clamping,

means positioned at the free end of the boom;

f6 a horizontal slide-frame rotatably supported; in saidclamping i aeans l1ft1ng-arm-s depend ing from said frame;load grippmg means 5a' means positioned at the free end of the boom;

a horizontal slide frame rotatablysupportcd r in said clamping means; lifting armsdependmg from said frame; load gripping-means positioned ronthe'lifting arms, and means to rotate said gripping -means and load in a vertical plane. V 5. In a hoist'of the character described, a' column; a. post longitud nally movable therein; a boom secured to saidpost clamp. in'g means positioned at'the free. end of the boom; a horizontalslide-frame rotatably supportedinsaid clamping means; lifting arms depending fromsaidframe; load gripping means positioned'on the lifting arms;

means to rotate said gripping means and load ;in" a vertical plane, and means to hold the same automatically in any selected inclined position.

6. In a hoist of the character described, a column; a post longitudinally moveable therein; a boom secured to said post; clamping means positioned at the free end of the boom; 'a horizontal slide-frame rotatably supported in said clampingmeans; lifting armsdepending from said frame; load gripping means positioned on the lifting arms, and unitary self-locking means to rotate and sold said gripping means and load in any selected position. 7

7. In a hoist of the character described, a pair of load gripping means adapted to grip the load at substantially diametrally opposite points; unitary self-locking means positioned on each gripping means to rotate same and the loa d thereon in a vertical plane, and means to unlock either one of said self-locking means to tilt said load by the other selflocking gripping means. I

8. In a hoist of the character described, a liI Ol load gripping means adapted to grip the load at substantially diametrally oppoltepoints; self-locking means to rotate said ripping means and load in a vertical plane; elf-locking means comprising a Worm worm-gear consisting of an outer gearand an inner hub portion rotatable'relacly to cach other, and means to lock the gear-ring and hub portion to form a rigid unit. I i

9. In a hoist of the character described, a of load gripping means adapted to grip e load at substantially diametrally opposite ts self-locking means to rotate said ping means and load in a vertical plane; self-locking means comprising a Worm and a Worm-gear consisting of an outer gearringand an inner hub portion rotatable relatively to each other; means to hold said gearlid hub portion in co-planar rotatable relatioinand means to lock said component sarts ofthe'worm gear to form a rigid unit. '10 In a hoist of the character described, a peir'ofload ripping means adapted to grip m d at subs antially diametrally opposite 'nts; self-locking meansto rotate said gripg means and load in a vertical plane; said self-locking means comprising a Worm and a 'Wormgear consisting of an'outer gear-ring andan inner hub portio'n rotatable relatively toeach other, andiunitary :means to selecivclyhold the component parts of said worm-gear in independent rotatable relation and in rigidiy connected relation.

In testimony whereof We afiix our signatures. V v

if FRANK D. FORADAS.

THOMAS HASAPES 

